I wouldn't clean the cage just yet. If fact baby hams wee so little that it should be fine with just spot cleaning the wet corner for couple of weeks yet as long as he is not weeing in bed or anything. Leave it as long as you can and when you do clean always add some of the old stuff sprinkled over the new so he keeps some of his scent. He will get used to the new wheel so just leave i in there calmly and continue as normal with he taming.
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